com.twitter.scalding.reducer_estimation

HistoryReducerEstimator

trait HistoryReducerEstimator extends ReducerEstimator

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ReducerEstimator, AnyRef, Any
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  1. abstract def estimateReducers(info: FlowStrategyInfo, history: Seq[FlowStepHistory]): Option[Int]

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  2. abstract def historyService: HistoryService

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  10. def estimateReducers(info: FlowStrategyInfo): Option[Int]

    Estimate how many reducers should be used.

    Estimate how many reducers should be used. Called for each FlowStep before it is scheduled. Custom reducer estimators should override this rather than apply() directly.

    info

    Holds information about the overall flow (.flow), previously-run steps (.predecessorSteps), and the current step (.step).

    returns

    Number of reducers recommended by the estimator, or None to keep the default.

    Definition Classes
    HistoryReducerEstimatorReducerEstimator
  11. def finalize(): Unit

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  16. final def notify(): Unit

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  20. final def wait(): Unit

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  21. final def wait(arg0: Long, arg1: Int): Unit

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  22. final def wait(arg0: Long): Unit

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Inherited from ReducerEstimator

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